Losing accounts even with proxies

Been doing traffic arbitrage for a few months now and started running into a wall with account bans. Use separate proxies for each project matching whatever country the campaign is targeting, figured that alone would keep things clean between accounts. Still getting hit with warnings about multiple accounts and losing profiles left and right even though the IPs are all different. Feels like the platforms somehow know all these accounts are coming from the same place regardless of the proxy setup. How are they pulling that off, and what's actually needed to work around it?

IP address is just one piece of what gets checked, platforms pull a whole fingerprint off the browser itself, screen resolution, installed fonts, canvas rendering, timezone settings, way more than people realize goes into that profile. Swapping the proxy changes where the traffic looks like it's coming from, but the browser underneath still hands over the exact same fingerprint every single time. That's usually the part catching people off guard once they've already sorted out the IP side of things.

People spend weeks tweaking proxy settings and swapping IPs, but the browser itself can rat out the real connection completely on its own, no proxy involved at all. There's a leak that happens outside the whole proxy setup entirely. Worth reading up on what a WebRTC leak actually is here: https://gologin.com/blog/what-is-a-webrtc-leak/ . Basically the browser can expose the real IP through a separate channel even while a proxy is active elsewhere, which alone can tie multiple accounts back together. Running each profile through an antidetect browser handles both problems at once, masking the fingerprint and closing that leak so every account looks like it's coming from a genuinely separate setup.